A kind of positive electrode slurry of lithium ion battery and preparation method thereof

Abstract

The invention discloses lithium ion battery positive electrode slurry and a preparation method thereof. The lithium ion battery positive electrode slurry includes the following raw materials in partsby weight: 86 to 93 parts of positive electrode active material; 2 to 6 parts of conductive agent, 4 to 7 parts of adhesive, 1 to 4 parts of chitosan, 2 to 4 parts of 1-ethyl-3-methylimidazolium tetrafluoroborate, 32 to 46 parts of water and 13 to 22 parts of absolute ethanol. Compared with the prior art, the invention uses safe and non-toxic water and ethanol as the dispersion medium of the positive electrode slurry, adds chitosan as the dispersant to the formulation of the positive electrode slurry, and adds the conductive ionic liquid in cooperation with the solid conductive agent as the conductive material; and in the preparation process, the cathode active material and conductive agent were dispersed in ethanol by ball milling, and then mixed with other raw materials to improve the dispersion and uniformity of the cathode slurry, and then the lithium ion battery with good cycle performance is obtained.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, and in particular relates to a positive electrode slurry of lithium ion batteries and a preparation method thereof. Background technique [0002] Lithium-ion batteries are by far the most versatile and adaptable secondary batteries. As a new type of green power source, lithium-ion batteries have many excellent properties, such as high energy density, long cycle life, high open circuit voltage, no memory effect, safety and pollution-free, etc. [0003] However, in the process of preparing the positive electrode of the traditional lithium ion battery, in order to seek the dispersibility of the positive electrode active material and the conductive agent in the slurry, an organic solvent is often used as the dispersion medium of the positive electrode slurry, but the organic solvent is easy to cause environmental pollution, and It is harmful to the health of operators, so it is necessa...

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Problems solved by technology

[0003] However, in the process of preparing the positive electrode of the traditional lithium ion battery, in order to seek the dispersibility of the positive electrode active material and the conductive agent in the slurry, an organic solvent is often used as the dispersion medium of the positive electrode slurry, but the organic solvent is easy to cause environmental pollution, and It is harmful to the health of operators, so it needs to increase the cost input to recover the organic solvent during the coating and drying process

[0004] Moreover, even if organic solvents are used, most lithium-ion battery manufacturers still have the disadvantages of uneven dispersion of the positive electrode slurry of lithium iron phosphate lithium-ion batteries and poor processing performance of the pole pieces. Add in batches, dry powder mixing and other methods to improve the dispersion effect and processing performance of the material, but the effect is not obvious

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